Tubular core assemblies for rolls of paper or other sheet material

Abstract

A stand-alone lug of non-isotropic polymeric or cellulosic material for installation in a recess in a core member of paperboard material for a roll of paper or other sheet material. The lug has a width in the range of from about 0.25 to about 4 inches, a length in the range of from about 0.5 to about 4 inches, and a thickness in the range of from about 0.25 to about 1 inch. The lug also having at least one radially inner surface, the total circumferential width of the inner surface or surfaces being at least about 0.2 inches. The lug may have a recess extending from one end for receiving a key on a stub-chuck. Where the lug is to be used with splined stub-chucks, the lug may have no recess.

1. A tubular core assembly for a roll of paper or other sheet material having a hollow cylindrical core member formed of paperboard material, said core member having a recess extending axially inwardly from an end thereof and radially outwardly from an inner surface thereof at least partway to an outer surface thereof, said core member recess having opposed side surfaces and a rear surface extending upwardly from said inner surface, and a stand-alone lug of non-isotropic polymeric or cellulosic material in the core member recess, said lug having side surfaces extending from top to bottom and from front to rear of said lug and a rear surface extending from said top to said bottom and from side to side of said lug, said lug side surfaces engaging the side surfaces of the core member recess and said lug rear surface engaging the rear surface of the core member recess, the core member having an outer diameter in the range of from about 3 to about 14 inches and an inner diameter in the range of from about 2 to about 13 inches, the core member recess and the lug each having a circumferential width in the range of from about 0.25 to about 4 inches, an axial length in the range of from about 0.5 to about 4 inches, and a radial thickness in the range of from about 0.25 to about 1 inch, and the lug having at least one radially inner surface flush with the inner surface of the core member adjacent the end thereof, the total circumferential width of the inner surface or surfaces of the lug being at least about 0.2 inches, said lug having a recess for receiving a key on a stub-chuck, said lug recess extending axially inwardly from an end of the lug adjacent said end of the core member, and said lug recess extending radially outwardly from an inner surface of the lug only partway to an outer surface thereof, whereby the lug has a roof portion over the recess. 
     
     
       2. A tubular core assembly according to  claim 1  wherein the core member recess and the lug recess are rectangular in plan view. 
     
     
       3. A tubular core assembly according to  claim 1  wherein the lug recess has a circumferential width in the range of from about 0.125 to about 3 inches and an axial length in the range of from about 0.25 to about 3.75 inches. 
     
     
       4. A tubular core assembly according to  claim 1  wherein the lug has an axially extending spline projecting from at least one side surface and digging into a side of the core member recess to assist in positioning the lug therein. 
     
     
       5. A tubular core assembly according to  claim 1  wherein the lug has at least one rear spline projecting therefrom and digging into a rear surface of the core member recess to assist in positioning the lug therein. 
     
     
       6. A tubular core assembly according to  claim 1  wherein the lug has a pair of stabilizers each projecting from the bottom of a respective side wall thereof adjacent an inner surface of the core member to stabilize the lug when engaged by a stub-chuck. 
     
     
       7. A tubular core assembly according to  claim 1  wherein the total circumferential width of the inner surface or surfaces of the lug is at least about 0.4 inches. 
     
     
       8. A tubular core assembly according to  claim 1  mounted on a stub-chuck, the inner surface or surfaces of the lug engaging at least about 2.25% of the periphery of the stub-chuck. 
     
     
       9. A stand-alone lug of non-isotropic polymeric or cellulosic material for installation in a recess in a core member of paperboard material for a roll of paper or other sheet material, said lug having side surfaces extending from top to bottom and from front to rear of said lug and a rear surface extending from said top to said bottom and from side to side of said lug, said surfaces contacting said recess in said paper board cores, said lug having a width in the range of from about 0.25 to about 4 inches, a length in the range of from about 0.5 to about 4 inches, and a thickness in the range of from about 0.25 to about 1 inch, and said lug also having at least one radially inner surface, the total circumferential width of the inner surface or surfaces being at least about 0.2 inches, said lug having a recess extending from one end thereof for receiving a key on a stub-chuck, the recess extending radially outwardly from an inner surface of the lug only partway to an outer surface thereof, whereby the lug has a roof portion over the recess. 
     
     
       10. A lug according to  claim 9  wherein the recess is rectangular in plan view. 
     
     
       11. A lug according to  claim 9  when the recess has a width in the range of from about 0.25 to about 3 inches and a length in the range of from about 0.25 to about 3.75 inches. 
     
     
       12. A lug according to  claim 9  also having a spline projecting from at least one side surface thereof for digging into a side of a core member recess to assist in positioning the lug therein. 
     
     
       13. A lug according to  claim 9  also having at least one rear spline projecting therefrom for digging into a rear surface of the core member recess to assist in positioning the lug therein. 
     
     
       14. A lug according to  claim 9  also having a pair of stabilizers each projecting from the bottom of a respective side wall thereof so that in use the stabilizers are positioned adjacent an inner surface of the core member to stabilize the lug when engaged by a stub-chuck. 
     
     
       15. A lug according to  claim 9  wherein the total circumferential width of the inner surface or surfaces is at least about 0.4 inches. 
     
     
       16. A tubular core assembly for a roll of paper or other sheet material having a hollow cylindrical core member formed of paperboard material, said core member having a recess extending axially inwardly from an end thereof and radially outwardly from an inner surface thereof at least partway to an outer surface thereof, said core member recess having opposed side surfaces and a rear surface extending upwardly from said inner surface, and a stand-alone lug of non-isotropic polymeric or cellulosic material in the core member recess, said lug having side surfaces extending from top to bottom and from front to rear of said lug and a rear surface extending from said top to said bottom and from side to side of said lug, said lug side surfaces engaging the side surfaces of the core member recess and said lug rear surface engaging the rear surface of the core member recess, the core member having an outer diameter in the range of from about 3 to about 14 inches and an inner diameter in the range of from about 2 to about 13 inches, the core member recess and the lug each having a circumferential width in the range of from about 0.25 to about 4 inches, an axial length in the range of from about 0.5 to about 4 inches, and a radial thickness in the range of from about 0.25 to about 1 inch, and the lug having at least one radially inner surface flush with the inner surface of the core member adjacent the end thereof, the total circumferential width of the inner surface or surfaces of the lug being at least about 0.2 inches, said lug having a recess for receiving a key on the stub-chuck, said lug recess extending axially inwardly from and end of the lug adjacent said end of the core member, and said lug recess extending axially inwardly from said end of the lug less than halfway along the length of the lug. 
     
     
       17. A tubular core assembly for a roll of paper or other sheet material having a hollow cylindrical core member formed of paperboard material, said core member having a recess extending axially inwardly from an end thereof and radially outwardly from an inner surface thereof at least partway to an outer surface thereof, said core member recess having opposed side surfaces and a rear surface extending upwardly from said inner surface, and a stand-alone lug of non-isotropic polymeric or cellulosic material in the core member recess, said lug having side surfaces extending from top to bottom and from front to rear of said lug and a rear surface extending from said top to said bottom and from side to side of said lug, said lug side surfaces engaging the side surfaces of the core member recess and said lug rear surface engaging the rear surface of the core member recess, the core member having an outer diameter in the range of from about 3 to about 14 inches and an inner diameter in the range of from about 2 to about 13 inches, the core member recess and the lug each having a circumferential width in the range of from about 0.25 to about 4 inches, an axial length in the range of from about 0.5 to about 4 inches, and a radial thickness in the range of from about 0.25 to about 1 inch, and the lug having at least one radially inner surface flush with the inner surface of the core member adjacent the end thereof, the total circumferential width of the inner surface or surfaces of the lug being at least about 0.2 inches, said lug having an unrecessed lower surface extending for the circumferential width thereof for engagement by splines on a stub-chuck. 
     
     
       18. A stand-alone lug of non-isotropic polymeric or cellulosic material for installation in a recess in a core member of paperboard material for a roll of paper or other sheet material, said lug having side surfaces extending from top to bottom and from front to rear of said lug and a rear surface extending from said top to said bottom and from side to side of said lug, said surfaces contacting said recess in said paper board core, said lug having a width in the range of from about 0.25 to about 4 inches, a length in the range of from about 0.5 to about 4 inches, and a thickness in the range of from about 0.25 to about 1 inch, and said lug also having at least one radially inner surface, the total circumferential width of the inner surface or surfaces being at least about 0.2 inches, said lug having a recess extending from one end thereof for receiving a key on a stub-chuck, the recess extending axially inwardly from said end of the lug less than halfway along the length of the lug. 
     
     
       19. A stand-alone lug of non-isotropic polymeric or cellulosic material for installation in a recess in a core member of paperboard material for a roll of paper or other sheet material, said lug having side surfaces extending from top to bottom and from front to rear of said lug and a rear surface extending from said top to said bottom and from side to side of said lug, said surfaces contacting said recess in said paper board core, said lug having a width in the range of from about 0.25 to about 4 inches, a length in the range of from about 0.5 to about 4 inches, and a thickness in the range of from about 0.25 to about 1 inch, and said lug also having at least one radially inner surface, the total circumferential width of the inner surface or surfaces being at least about 0.2 inches, said lug having an unrecessed lower surface extending for the circumferential width thereof for reengagement by splines on a stub-chuck.